Hair straightener



FIG. 1 is a top plan view of the hair straightener;

FIG. 2 is a bottom plan view of the hair straightener;

FIG. 3 is a right side elevation view of the hair straightener;

FIG. 4 is a left side elevation view of the hair straightener;

FIG. 5 is an enlarged top perspective view of the hair straightener; and

FIG. 6 is an enlarged bottom perspective view of the hair straightener.

FIG. 7 is a top perspective view of the hair straightener; and,

FIG. 8 is a bottom perspective view of the hair straightener. 

CLAIM The ornamental design for a hair straightener, as shown and described. 